How many Neutrons does Calcium have if it has 20 electrons and an atomic number of 41?

How many energy levels? Explain your answer.

Writing net ionic equation: of cu with nitric acid

What does sedentary mean?

4130 J of energy is added to a 52 g sample of water that has an initial temperature of 10.0°C. If the specific heat of water is 4.18 J / (g * °C), what would the final temperature of the water be?

A solution containing equal numbers of hydrogen ions and hydroxide ions is

Which would exhibit characteristics of both a metal and a nonmetal? select one: a. si b. ge c. sb d. po e. all of the above exhibit characteristics of both a metal and a nonmetal?

In the synthesis reaction, the white powder produced is magnesium oxide (mgo, mm = 40.3 g/mol). how many moles of magnesium oxide were formed (number of moles = mass (g) / molar mass (g/mol)) ? choose the closest answer. a. 0.21 moles b. 0.

Which of the following is the most likeley example of an favorable mutation A. A mutation that makes a rabbit able run faster B. A mutation that changes the rabbit's fur to bright orange C. A mutation that changes the color of the rabbit's eyes D.

Which of these mole ratios is possible for this reaction? FeCl3 + 3NaOH → Fe (OH) 3 + 3NaCl 1:1 1:3 3:1 2:3

The chemical equation for reduction of phosphorite Ca3 (PO4) 2